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United States Patent | 6,030,177 |
Hager | February 29, 2000 |
A drive system for a variable diameter rotor system that includes a plurality of rotor blade assemblies with inner and outer blade segments. The outer blade segment being telescopically mounted to the inner blade segment. The drive system engaging a jackscrew for telescoping the outer blade segment with respect to the inner blade segment. The drive system includes a rotor hub that is pivotally mounted to the upper end of a main rotor shaft about a pivot point. A gimbaled bearing is disposed between and attached to the main rotor shaft and the rotor hub. The gimbaled bearing permits the rotor hub to pivot about the pivot point. A blade actuation shaft is concentrically disposed within the main rotor shaft. The blade actuation shaft has a constant velocity joint pivotally attached to its upper end about the pivot point. A planetary gearset engages the blade actuation shaft with the jackscrew. The planetary gearset includes a sun gear that is attached to the housing and a ring gear that is attached to the rotor hub. A plurality of pinion gears are disposed between and intermesh with the sun gear and the ring gear. The pinion gears are rotatably mounted to a pinion cage which, in turn, is rotatable with respect to the housing and the ring gear. A lower hypoid bevel gear is rotatably driven by the pinion gears and adapted to intermesh with an output pinion on the jackscrew.
Inventors: | Hager; Lee N. (Southbury, CT) |
Assignee: | Sikorsky Aircraft Corporation (Stratford, CT) |
Appl. No.: | 215803 |
Filed: | December 18, 1998 |
Current U.S. Class: | 416/87; 244/8; 244/17.23; 244/39; 244/56; 416/88; 416/89; 416/170R; 475/269; 475/296; 475/302 |
Intern'l Class: | B64C 011/04; B64C 027/72; F01D 007/00; F03B 003/14 |
Field of Search: | 416/87,88,89,170 R,169 R 244/8,17.23,56,39 475/296,302,269 |
4080097 | Mar., 1978 | Hager et al. | 416/87. |
4566856 | Jan., 1986 | Miller | 416/134. |
4580945 | Apr., 1986 | Miller | 416/134. |
4804352 | Feb., 1989 | Schmidt | 464/17. |
5116201 | May., 1992 | Fradenburgh et al. | 416/140. |
5253979 | Oct., 1993 | Fradenburgh et al. | 416/223. |
5299912 | Apr., 1994 | Fradenburgh et al. | 416/87. |
5620303 | Apr., 1997 | Moffitt et al. | 416/87. |
5620304 | Apr., 1997 | Matsuka et al. | 416/87. |
5636969 | Jun., 1997 | Matuska et al. | 416/87. |
5642982 | Jul., 1997 | Matuska et al. | 416/87. |
5655879 | Aug., 1997 | Kiely et al. | 416/87. |
5735670 | Apr., 1998 | Moffitt et al. | 416/87. |